How DTMF works?

Posted By Raja Sundar on Jul 16, 2014

DTMF (Dual Tone Multiple Frequency) is a bit sound generated when we touch any one of the telephone key. This sound arises with the combination of two separate frequencies merge together at the same time to produce a unique tone and it is mainly used in TELECOMMUNICATION. The two sinusoidal signals of frequencies (Analog DTMF telephone signal) is a combination of low and high frequencies. There are totally 16 pairs of dual tone...